20725253 has 4 divisors (see below), whose sum is σ = 20829600. Its totient is φ = 20620908.

The previous prime is 20725249. The next prime is 20725273. The reversal of 20725253 is 35252702.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20725253 - 2² = 20725249 is a prime.

It is a super-2 number, since 2×20725253² = 859072223828018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20725273) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51875 + ... + 52272.

It is an arithmetic number, because the mean of its divisors is an integer number (5207400).

Almost surely, 2^20725253 is an apocalyptic number.

It is an amenable number.

20725253 is a deficient number, since it is larger than the sum of its proper divisors (104347).

20725253 is a wasteful number, since it uses less digits than its factorization.

20725253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104346.

The product of its (nonzero) digits is 4200, while the sum is 26.

The square root of 20725253 is about 4552.4996430533. The cubic root of 20725253 is about 274.6839476499.

Adding to 20725253 its reverse (35252702), we get a palindrome (55977955).

It can be divided in two parts, 20725 and 253, that multiplied together give a palindrome (5243425).

The spelling of 20725253 in words is "twenty million, seven hundred twenty-five thousand, two hundred fifty-three".